﻿/*
 * Twipler - Twitter Web Client with features.
 *  
 *  Copyright (C) 2009, 2010. Ian Quigley
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details. 
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 */

using System;
using System.Collections.Generic;
using System.Text;


namespace Twipler.App.Render.Tree
{
    public abstract class AbstractItem
    {
        public abstract List<AbstractItem> Children { get; }

        public abstract void Render(StringBuilder html, App.Machine.Environment environment);

        public virtual string PostbackId { get { return string.Empty; } }

        public virtual void Postback(App.Machine.Environment environment)
        {
        }

        protected string RandomString(int length)
        {
            Random r = Current.Random;
            StringBuilder rndstr = new StringBuilder(length + 5);

            string from = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

            for (int i = 0; i < length; i++)
                rndstr.Append(from[r.Next(0, from.Length)]);

            return rndstr.ToString();
        }
    }
}
